Date (happened)
  • 1957 (probable)
    derived from the event's own title: "Audience question about changing the picture of the world at a 1957 meeting"
  • before 9 January 1964
    passage 528255 in lecture nid 1033: 'Someone asked the other night'
Told / reported
9 January 1964
surviving delivery claim on lecture nid 1033